17
513 01 3402 02
Defrost
The defrost control is a time/temperature control which includes
a field
−
selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set
at 60 minutes). To initiate a forced defrost, two options are
available depending on the status of the defrost thermostat.
If defrost thermostat is closed, speed
−
up pins (J1) must be
shorted by placing a flat head screw driver in between for 5 sec
and releasing, to observe a complete defrost cycle. When the
Quiet Shift switch is selected, compressor will be turned off for
two 30 sec intervals during this complete defrost cycle, as
explained previously. When Quiet Shift switch is in factory default
OFF position, a normal and complete defrost cycle will be
observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch
is in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with
compressor operation). On return to heating operation,
compressor will again turn off for an additional 30 sec and the
outdoor fan for 40 sec. When the Quiet Shift is in OFF position,
only a brief 30 sec. cycle will be observed.
NOTE
: Unit will remain in defrost until defrost thermostat reopens
at approximately 65
F +/
−
5
F (18
C +/
−
2.8
C) coil temperature
at liquid line or remainder of defrost cycle time.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This heat pump unit
should be inspected at least once each year by a qualified
service person. To troubleshoot unit, refer to Table 7.
NOTE
: TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury or death and unit component damage.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical
skills, tools and equipment. If you do not possess
these, do not attempt to perform any maintenance on
this equipment, other than those procedures
recommended in the Owner’s Manual.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow these warnings could result in
personal injury or death:
1. Turn off electrical power to the unit and install a
lockout tag before performing any maintenance
or service on this unit.
2. Use extreme caution when removing panels
and parts.
3. Never place anything combustible either on
or in contact with the unit.
!
WARNING
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper
operation.
Errors made when reconnecting wires may cause
improper and dangerous operation. Label all wires
prior to disconnecting when servicing.
CAUTION
!
The minimum maintenance requirements for this equipment are
as follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness each
cooling season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each cooling season. Service when
necessary.
Step 1 — Air Filter
IMPORTANT
: Never operate the unit without a suitable air filter in
the return
−
air duct system. Always replace the filter with the
same dimensional size and type as originally installed. See
Table 1 for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway
−
type) or clean (cleanable
−
type) at least twice during
each cooling season and twice during the heating season, or
whenever the filter becomes clogged with dust and lint.
Indoor Blower and Motor
NOTE
: All motors are pre
−
lubricated. Do not attempt to lubricate
these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect and tag electrical power to the unit before
cleaning the blower motor and wheel.
!
WARNING
To clean the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove blower access panel (see FIGURE 16).
b. Disconnect indoor blower motor. Remove capacitor if
required.
c. On all units remove blower assembly from unit.
Remove screws securing blower to blower partition
and slide assembly out. Be careful not to tear
insulation in blower compartment.
d. Ensure proper reassembly by marking blower wheel
and motor in relation to blower housing before
disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft,
remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of
housing.
2. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel
orientation.
